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(No Model.)

G. P. SIMPSON.

GRINDING MILL.

No. 347,968. Patented Aug. 24, 1886..

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I UNITED STATES:

PATENT QFFIOE.

GEORGEIF. SIMPSON, or BROOKLYN, NEW YORK.

GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 347,968, dated August24, 1886.

Application filed March 5, 1886.

To all whom it may concern.-

Be it known that I, GEORGE F. SIMPsoN, of

Brooklyn, in the county of Kings and State of New York, have inventedcertain new and useful Improvements in Grinding- Mills, of which thefollowing is a specification.

My improvements relate to mills employed for grinding grain and otherdry materials.

I will describe in detail a mill embodying my improvements, and thenpoint out the novel features in the claims.

In the accompanyingdrawings, Figure 1 is an elevation,'partly insection, of a inillembodying my improvement. Fig. 2 is a horizontalsection thereof, taken on the plane of the dotted line as m, Fig. 1..Fig. 3 is a detail view of a certain portion of the mill, partly insection, and a portionbeing broken away to.

save space. Fig. 4 is an enlarged side view of a propeller that iscomprised in the mill. Fig. 5 is atop view of this propeller on the samescale as Fig. 4.. Fig. 6 is an end view of the propeller on the samescale as Fig. 4.

Similar letters of reference designate corresponding parts in all thefigures.

A designates the base piece of the frame of the mill, and a uprightsextending therefrom. The base and uprights are made of cast-iron and areintegral. The uprights a unite near their upper ends, forming a centralportion, a.

Upon the central portion (t'is rigidly mounted the chamber of the mill.The chamber comprises a lower dish-shaped portion, B, which is providednear its edge with an upwardlyextending circumferential flange, b.

O designates a cover or cap, provided upon its under side with acircumferential rabbeted flange, c, fitting over the flange I) on thedishshaped portion 13. The cover 0 is secured to the portion B by meansof bolts 0, which are pivotally connected near their lower ends to lugsIf on the portion B by means of pins passing through said lugs andthesaid bolts. The bolts may therefore be swung up and down. In theposition shown in Fig. 1 they extend into radial slots in the peripheryof the cap 0, and are there held in position by means of nuts 0. Somedistance inward from the edge of the cover 0 the same is provided with adownwardly-extending circumferential flange or apron, 0 The generalcontour of the interior of the cover C is concave.

Serial No. 194,096. No model.)

D designates a driving-shaft, which is arranged vertically and isjournaled in a stepbearing at its lower end. Said bearing is an rangedcentrally in the base A of the frame. It consists of a hub, d, formingpart of the base A, and provided with a vertically-extending aperture,which will preferably be circular. Arranged within this aperture, so asto be capable of being freely moved up and down therein, is ahollow cup,(1". A ring, d preferably of steel, fits within the cup (1 and rests atits lower end upon the bottom thereof. Vithin the ring (1 and alsoresting upon the bottom of the cup (1 is a button or knob, (1",preferably of steel, and having acouvex upper surface. The lower portionof the shaft D extends within the ring (P, and the end thereof has aconvex surface, which rests upon the convex surface of the knob (1".

Within a cavity, d in the base A, is arranged a lever, d. This lever isfulcrumed at its inner end to the walls of the cavity. Its outer endextends beyond the base A. A link, (P, is pivotallyconnccted near itslower end to the lever (2 beyond the base, and at its upper end to oneend of alever, (Z Thelever d is pivotally connected to one of theuprights a of the frame. It has a lug, (1, provided with ascrew-threaded aperture through which extends, vertically, a screw,d,'the lower end of which impinges on the lever d. A weight, d, is hungupon the lever (7 It may be hung in different positions thereon bymoving it lengthwise. The cup (2 rests upon the lever (1. By adjustingthe screw d the lever d may be raised or lowered, thereby elevating orlowering the shaft D. The shaft D extends centrally through the portiona of the frame,

and bears upon its upper end a plate, E, arranged centrally thereon, andhorizontally within the dish'shaped portion B. A metal plate, 6, isbolted to the upper side of the plate E. The upper surface of the platee is preferably serrated, and constitutes a grinding-surface. Spiralribs e upon the plate e tend to distribute material to be ground overthe grinding-surface.

Above the plate 0, and arranged eccentrically thereto, is a plate, F,provided upon its under side with a grinding-surface. When the plate eis rotated the plate F is rotated eecentrically above the same by thegrain or der side of a plate, f, which latter plate is provided with acentral opening and a vertically-extending integral chute, f The chute fextends through and is supported by the cover 0. It is so supported bymeans of a circumferential flange,f, upon the chute which extends overthe cover.

Between the chute the platefland the downwardly-extending apron 0* onthe cover 0 is a neutral ring, f. I prefer to make this ring of acomposition metal-such, for in stance, as brass-to lessen wearing andheating. A'curved circumferential apron,f on the plate f, prevents theground material from coming in contact with the neutral ring, f..

A washer of leather, w, fits tightly around the flange or apron a, andextends over the apron f for the same purpose.

Bolted or otherwise secured to the upper side of the ringf isapropeller, G. This propeller consists of a-thin piece of metalextending upwardly from the plate f, and more or less at an angle toradii thereof. It is also leaned over sidewise. It will be observed thatit fills or nearly fills the space between the plate f, the apron f andthe cover 0, and that it extends well down below the plate f. Thispropeller rotates with the plates F f, and it'keeps the side of thechamber free from ground material which would otherwise gather there. Byarranging the propeller at an angle to radii of the platef and leaningit over, it forces the particles of ground material outwardly againstthesides of the chamber and also downwardly. Its extreme inner end bearsagainst the washer w and maintains the latter in the proper position.

Motion is imparted to the shaft D by means of a belt, H, passing arounda pulley, h, mounted on said shaft. After leaving said pulley the beltpasses around two pulleys, H, and thence over a pulley, H, mounted onthe usual shafting. One of the pulleys, H, is

mounted in hearings in a frame, I, and the other pulley, H, is mountedin bearings in a similar frame, I. The framesII are arranged side byside upon a plate, J, which is bolted to one of the uprights a of theframe, as shown more clearly in Fig. 2. Each of the frames may be turnedupon a pivot, j, so that the pulleys H will rotate relatively to theplane of rotation of the pulley h, in more or less angular planes toproperly direct a belt when a driving-pulley is arranged as shown inFig. 1. I have shown one of the pulleys so arranged in Fig. 3. When thepulleys have been adjusted to the desired angle the frames may belocked, so as to maintain the pulleys in such position by bolts jextending through the plate J, and circularly-shaped slots in the backsof the frames. This adjustment provides a ready means for arranging thepulleys so that the belt will not slip off.

Provision is afforded by the slots j in the plate J for moving theframes I I, and the pulleys H toward and from each other, so as to adaptthe pulleys H for receiving a belt from a driving-pulley in the positionshown in Fig. 3.

What I claim as my invention, anddesire to.

secure by Letters Patent, is-

1. In a mill, the combination, with a cham ber, of upper and lowergrinders, a plate upon which the upper grinder is mounted, a propeller,as G, extending upwardly from the plate, and at an angle to radii of thegrinder, the same being leaned over sidewise and extending downwardlybelow the said plate,substantially as specified.

2. The combination,with the driving-shaft D. of the pulley h, the beltH, the pulleys H, and frames I I, in which said pulleys are journaled,the pulleys H being adjustable at an angle relatively to the plane ofrotation of the pulley h, and also adjustable toward and from eachother, substantiallyas specified.

- GEO. F. SIMPSON.

Witnesses:

EDWIN H. BROWN, J AS. R. BOWEN.

